In geometry, a translation is the shifting of a figure from one place to another without rotating, reflecting or changing its size. This is done by moving the vertices of the figure the prescribed number of spaces on a coordinate plane and then drawing the new figure.
These PFDs are designed to keep the wearer in a vertical position, but it is the wearersâ responsibility to maneuver themselves into a face-up position. Type III PFDs will keep unconscious wearers face-up just as well as a Type II vest.
Head Cooling Study. 2 PFDs â one worn with the back of the head. immersed, (head in, body in); one worn with the. head out of the water (head out, body in). Controls: dry suit with the head protected (head. out, body out); dry suit with the back of the. head immersed (head in, body out) Head Cooling Study.